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Reports <code>synchronized</code> blocks that lock on an instance of <code>java.util.concurrent.locks.Lock</code>.
Such synchronization is almost certainly unintended, and appropriate versions of <code>.lock()</code>
and <code>.unlock()</code> should be used instead.
<p><b>Example:</b></p>
<pre><code>
  final ReentrantLock lock = new ReentrantLock();

  public void foo() {
    synchronized (lock) {}
  }
</code></pre>
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